#!/bin/sh
set -e

[ -n "$WEAVE_DEBUG" ] && set -x

SCRIPT_VERSION="unreleased"
IMAGE_VERSION=latest
[ "$SCRIPT_VERSION" = "unreleased" ] || IMAGE_VERSION=$SCRIPT_VERSION
IMAGE_VERSION=${WEAVE_VERSION:-$IMAGE_VERSION}

# Minimum tested version of Docker + Weave Net
MIN_DOCKER_VERSION=1.10.0

# These are needed for remote execs, hence we introduce them here
DOCKERHUB_USER=${DOCKERHUB_USER:-weaveworks}
BASE_EXEC_IMAGE=$DOCKERHUB_USER/weaveexec
EXEC_IMAGE=$BASE_EXEC_IMAGE:$IMAGE_VERSION
WEAVEDB_IMAGE=$DOCKERHUB_USER/weavedb:latest
BASE_IMAGE=$DOCKERHUB_USER/weave
IMAGE=$BASE_IMAGE:$IMAGE_VERSION
PROXY_HOST=${PROXY_HOST:-$(echo "${DOCKER_HOST#tcp://}" | cut -s -d: -f1)}
PROXY_HOST=${PROXY_HOST:-127.0.0.1}
DOCKER_CLIENT_HOST=${DOCKER_CLIENT_HOST:-$DOCKER_HOST}

# Define some regular expressions for matching addresses.
# The regexp here is far from precise, but good enough.
IP_REGEXP="[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}"
CIDR_REGEXP="$IP_REGEXP/[0-9]{1,2}"

######################################################################
# helpers that run locally, even without --local
######################################################################

usage_no_exit() {
    cat >&2 <<EOF
Usage:

weave --help | help
      setup
      version

weave launch        [--password <pass>] [--trusted-subnets <cidr>,...]
                    [--host <ip_address>]
                    [--name <mac>] [--nickname <nickname>]
                    [--no-restart] [--resume] [--no-discovery] [--no-dns]
                    [--dns-listen-address <address>:<port>]
                    [--ipalloc-init <mode>]
                    [--ipalloc-range <cidr> [--ipalloc-default-subnet <cidr>]]
                    [--plugin=false] [--proxy=false]
                    [-H <endpoint>] [--without-dns] [--no-multicast-route]
                    [--no-rewrite-hosts] [--no-default-ipalloc]
                    [--hostname-from-label <labelkey>]
                    [--hostname-match <regexp>]
                    [--hostname-replacement <replacement>]
                    [--rewrite-inspect]
                    [--log-level=debug|info|warning|error]
                    [--token <weave-cloud-service-token>]
                    <peer> ...

weave prime

weave env           [--restore]
      config
      dns-args

weave connect       [--replace] [<peer> ...]
      forget        <peer> ...

weave attach        [--without-dns] [--rewrite-hosts] [--no-multicast-route]
                      [<addr> ...] <container_id>
      detach        [<addr> ...] <container_id>

weave expose        [<addr> ...] [-h <fqdn>] [--without-masquerade]
      hide          [<addr> ...]

weave dns-add       [<ip_address> ...] <container_id> [-h <fqdn>] |
                    <ip_address> ... -h <fqdn>
      dns-remove    [<ip_address> ...] <container_id> [-h <fqdn>] |
                    <ip_address> ... -h <fqdn>
      dns-lookup    <unqualified_name>

weave status        [targets | connections | peers | dns | ipam]
      report        [-f <format>]
      ps            [<container_id> ...]

weave stop

weave reset         [--force]
      rmpeer        <peer_id> ...

where <peer>     = <ip_address_or_fqdn>[:<port>]
      <cidr>     = <ip_address>/<routing_prefix_length>
      <addr>     = [ip:]<cidr> | net:<cidr> | net:default
      <endpoint> = [tcp://][<ip_address>]:<port> | [unix://]/path/to/socket
      <peer_id>  = <nickname> | <weave internal peer ID>
      <mode>     = consensus[=<count>] | seed=<mac>,... | observer

To troubleshoot and visualize Weave networks, try Weave Cloud: http://www.weave.works/product/cloud/
EOF
}

usage() {
    usage_no_exit
    exit 1
}

docker_sock_options() {
    # Pass through DOCKER_HOST if it is a Unix socket;
    # a TCP socket may be secured by TLS, in which case we can't use it
    if echo "$DOCKER_HOST" | grep -q "^unix://" >/dev/null; then
        echo "-v ${DOCKER_HOST#unix://}:${DOCKER_HOST#unix://} -e DOCKER_HOST"
    else
        echo "-v /var/run/docker.sock:/var/run/docker.sock"
    fi
}

docker_run_options() {
    echo --privileged --net host $(docker_sock_options)
}

exec_options() {
    case "$1" in
        setup|setup-cni|launch|reset)
            echo -v /:/host -e HOST_ROOT=/host
            ;;
        # All the other commands that may create the bridge and need machine id files.
        # We don't mount '/' to avoid recursive mounts of '/var'
        attach|expose|hide)
            echo -v /etc:/host/etc -v /var/lib/dbus:/host/var/lib/dbus -e HOST_ROOT=/host
            ;;
    esac
}

exec_remote() {
    docker $DOCKER_CLIENT_ARGS run --rm \
        $(docker_run_options) \
        --pid host \
        $(exec_options "$@") \
        -e DOCKERHUB_USER="$DOCKERHUB_USER" \
        -e WEAVE_VERSION \
        -e WEAVE_DEBUG \
        -e WEAVE_DOCKER_ARGS \
        -e WEAVE_PASSWORD \
        -e WEAVE_PORT \
        -e WEAVE_HTTP_ADDR \
        -e WEAVE_STATUS_ADDR \
        -e WEAVE_CONTAINER_NAME \
        -e WEAVE_MTU \
        -e WEAVE_NO_FASTDP \
        -e WEAVE_NO_BRIDGED_FASTDP \
        -e DOCKER_BRIDGE \
        -e DOCKER_CLIENT_HOST="$DOCKER_CLIENT_HOST" \
        -e DOCKER_CLIENT_ARGS \
        -e PROXY_HOST="$PROXY_HOST" \
        -e COVERAGE \
        -e CHECKPOINT_DISABLE \
        -e AWSVPC   \
        $WEAVEEXEC_DOCKER_ARGS $EXEC_IMAGE --local "$@"
}

# Given $1 and $2 as semantic version numbers like 3.1.2, return [ $1 < $2 ]
version_lt() {
    VERSION_MAJOR=${1%.*.*}
    REST=${1%.*} VERSION_MINOR=${REST#*.}
    VERSION_PATCH=${1#*.*.}

    MIN_VERSION_MAJOR=${2%.*.*}
    REST=${2%.*} MIN_VERSION_MINOR=${REST#*.}
    MIN_VERSION_PATCH=${2#*.*.}

    if [ \( "$VERSION_MAJOR" -lt "$MIN_VERSION_MAJOR" \) -o \
        \( "$VERSION_MAJOR" -eq "$MIN_VERSION_MAJOR" -a \
        \( "$VERSION_MINOR" -lt "$MIN_VERSION_MINOR" -o \
        \( "$VERSION_MINOR" -eq "$MIN_VERSION_MINOR" -a \
        \( "$VERSION_PATCH" -lt "$MIN_VERSION_PATCH" \) \) \) \) ] ; then
        return 0
    fi
    return 1
}

check_docker_version() {
    if ! DOCKER_VERSION=$(docker -v | sed -n -e 's|^Docker version \([0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\).*|\1|p') || [ -z "$DOCKER_VERSION" ] ; then
        echo "ERROR: Unable to parse docker version" >&2
        exit 1
    fi

    if version_lt $DOCKER_VERSION $MIN_DOCKER_VERSION ; then
        echo "ERROR: weave requires Docker version $MIN_DOCKER_VERSION or later; you are running $DOCKER_VERSION" >&2
        exit 1
    fi
}

######################################################################
# main
######################################################################

[ "$1" = "--local" ] && shift 1 && IS_LOCAL=1

# Handle special case $1 commands that run locally at the client end
case "$1" in
    help|--help)
        usage_no_exit
        exit 0
        ;;
    version)
        # non-local "version" is special because we want to show the
        # version of the script executed by the user rather than what is
        # embedded in weaveexec.
        [ -z "$IS_LOCAL" ] && echo "weave script $SCRIPT_VERSION"
        ;;
    env)
        if [ "$2" = "--restore" ] ; then
            # "env --restore" is special because we always want to process it
            # at the client end.
            if [ "${ORIG_DOCKER_HOST-unset}" = "unset" ] ; then
                echo "Nothing to restore. This is most likely because there was no preceding invocation of 'eval \$(weave env)' in this shell." >&2
                exit 1
            else
                echo "DOCKER_HOST=$ORIG_DOCKER_HOST"
                exit 0
            fi
        fi
        ;;
    launch)
        # this is necessary because 'util_op run-container' doesn't do
        # an implied pull like 'docker run' does
        if [ -z "$IS_LOCAL" ] ; then
            for img in $IMAGE $WEAVEDB_IMAGE ; do
                docker inspect -f "_" $img >/dev/null 2>&1 || docker pull $img
            done
        fi
        ;;
    setup)
        # call 'docker pull' outside weaveexec so we don't need a
        # docker binary inside
        if [ -z "$IS_LOCAL" ] ; then
            for img in $IMAGE $EXEC_IMAGE $WEAVEDB_IMAGE ; do
                docker pull $img
            done
        fi
        ;;
    *)
        [ "$2" = "--help" ] && usage_no_exit && exit 0
        ;;
esac

if [ -z "$IS_LOCAL" ] ; then
    check_docker_version
    exec_remote "$@"
    exit $?
fi

######################################################################
# main (remote and --local) - settings
######################################################################

# Default restart policy for router/proxy
RESTART_POLICY="--restart always"
CONTAINER_NAME=${WEAVE_CONTAINER_NAME:-weave}

PLUGIN_NAME="$DOCKERHUB_USER/net-plugin"
OLD_PLUGIN_CONTAINER_NAME=weaveplugin
CNI_PLUGIN_NAME="weave-plugin-$IMAGE_VERSION"
CNI_PLUGIN_DIR=${WEAVE_CNI_PLUGIN_DIR:-$HOST_ROOT/opt/cni/bin}
VOLUMES_LABEL=weavevolumes
# Note VOLUMES_CONTAINER which is for weavewait should change when you upgrade Weave
VOLUMES_CONTAINER_NAME=weavevolumes-$IMAGE_VERSION
# DB files should remain when you upgrade, so version number not included in name
DB_CONTAINER_NAME=${CONTAINER_NAME}db

DOCKER_BRIDGE=${DOCKER_BRIDGE:-docker0}
BRIDGE=weave
# This value is overridden when the datapath is used unbridged
DATAPATH=datapath
CONTAINER_IFNAME=ethwe
BRIDGE_IFNAME=v${CONTAINER_IFNAME}-bridge
DATAPATH_IFNAME=v${CONTAINER_IFNAME}-datapath
PORT=${WEAVE_PORT:-6783}
HTTP_ADDR=${WEAVE_HTTP_ADDR:-127.0.0.1:6784}
STATUS_ADDR=${WEAVE_STATUS_ADDR:-127.0.0.1:6782}
PROXY_PORT=12375
OLD_PROXY_CONTAINER_NAME=weaveproxy
PROC_PATH="/proc"
COVERAGE_ARGS=""
[ -n "$COVERAGE" ] && COVERAGE_ARGS="-test.coverprofile=/home/weave/cover.prof --"

######################################################################
# general helpers; independent of docker and weave
######################################################################

# utility function to check whether a command can be executed by the shell
# see http://stackoverflow.com/questions/592620/how-to-check-if-a-program-exists-from-a-bash-script
command_exists() {
    command -v $1 >/dev/null 2>&1
}

fractional_sleep() {
    case $1 in
        *.*)
            if [ -z "$NO_FRACTIONAL_SLEEP" ] ; then
                sleep $1 >/dev/null 2>&1 && return 0
                NO_FRACTIONAL_SLEEP=1
            fi
            sleep $((${1%.*} + 1))
            ;;
        *)
            sleep $1
            ;;
    esac
}

run_iptables() {
    # -w is recent addition to iptables
    if [ -z "$CHECKED_IPTABLES_W" ] ; then
        iptables -S -w >/dev/null 2>&1 && IPTABLES_W=-w
        CHECKED_IPTABLES_W=1
    fi

    iptables $IPTABLES_W "$@"
}

# Insert a rule in iptables, if it doesn't exist already
insert_iptables_rule() {
    IPTABLES_TABLE="$1"
    shift 1
    if ! run_iptables -t $IPTABLES_TABLE -C "$@" >/dev/null 2>&1 ; then
        ## Loop until we get an exit code other than "temporarily unavailable"
        while true ; do
            run_iptables -t $IPTABLES_TABLE -I "$@" >/dev/null && return 0
            if [ $? != 4 ] ; then
                return 1
            fi
        done
    fi
}

# Delete a rule from iptables, if it exist
delete_iptables_rule() {
    IPTABLES_TABLE="$1"
    shift 1
    if run_iptables -t $IPTABLES_TABLE -C "$@" >/dev/null 2>&1 ; then
        run_iptables -t $IPTABLES_TABLE -D "$@" >/dev/null
    fi
}

# Send out an ARP announcement
# (https://tools.ietf.org/html/rfc5227#page-15) to update ARP cache
# entries across the weave network.  We do this in addition to
# configure_arp_cache because a) with those ARP cache settings it
# still takes a few seconds to correct a stale ARP mapping, and b)
# there is a kernel bug that means that the base_reachable_time
# setting is not promptly obeyed
# (<https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4bf6980dd0328530783fd657c776e3719b421d30>>).
arp_update() {
    # It's not the end of the world if this doesn't run - we configure
    # ARP caches so that stale entries will be noticed quickly.
    ! command_exists arping || $3 arping -U -q -I $1 -c 1 ${2%/*}
}

######################################################################
# weave and docker specific helpers
######################################################################

util_op() {
    if command_exists weaveutil ; then
        weaveutil "$@"
    else
        docker run --rm --pid host $(docker_run_options) \
            --entrypoint=/usr/bin/weaveutil $EXEC_IMAGE "$@"
    fi
}

check_forwarding_rules() {
    if run_iptables -C FORWARD -j REJECT --reject-with icmp-host-prohibited > /dev/null 2>&1; then
        cat >&2 <<EOF
WARNING: existing iptables rule

    '-A FORWARD -j REJECT --reject-with icmp-host-prohibited'

will block name resolution via weaveDNS - please reconfigure your firewall.
EOF
    fi
}

# Detect the current bridge/datapath state. When invoked, the values of
# $BRIDGE and $DATAPATH are expected to be distinct. $BRIDGE_TYPE and
# $DATAPATH are set correctly on success; failure indicates that the
# bridge/datapath devices have yet to be configured. If netdevs do exist
# but are in an inconsistent state the script aborts with an error.
detect_bridge_type() {
    BRIDGE_TYPE=$(util_op detect-bridge-type "$BRIDGE" "$DATAPATH")
    case "$BRIDGE_TYPE" in
        bridge|bridged_fastdp)
            ;;
        fastdp)
            DATAPATH="$BRIDGE"
            ;;
        *)
            return 1
            ;;
    esac

    # WEAVE_MTU may have been specified when the bridge was
    # created (perhaps implicitly with WEAVE_NO_FASTDP).  So take
    # the MTU from the bridge unless it is explicitly specified
    # for this invocation.
    MTU=${WEAVE_MTU:-$(cat /sys/class/net/$BRIDGE/mtu)}
}

validate_bridge_type() {
    detect_bridge_type || return 0

    if [ -n "$LAUNCHING_ROUTER" ] ; then
        if [ "$BRIDGE_TYPE" = bridge -a -z "$WEAVE_NO_FASTDP" ] &&
               util_op check-datapath 2>/dev/null ; then
            cat <<EOF >&2
WEAVE_NO_FASTDP is not set, but there is already a bridge present of
the wrong type for fast datapath.  Please do 'weave reset' to remove
the bridge first.
EOF
            return 1
        fi
        if [ "$BRIDGE_TYPE" != bridge -a -n "$WEAVE_NO_FASTDP" ] ; then
            cat <<EOF >&2
WEAVE_NO_FASTDP is set, but there is already a weave fast datapath
bridge present.  Please do 'weave reset' to remove the bridge first.
EOF
            return 1
        fi
    fi
}

expose_ip() {
    [ -z $WITHOUT_MASQUERADE ] || skipNAT="?skipNAT=true"
    ipam_cidrs allocate_no_check_alive weave:expose $CIDR_ARGS
    for CIDR in $ALL_CIDRS ; do
        call_weave "POST" "/expose/$CIDR$skipNAT"

        [ -z "$FQDN" ] || when_weave_running put_dns_fqdn_no_check_alive weave:expose $FQDN $CIDR
    done
}

# create veth with ends $1-$2, and then invoke $3..., removing the
# veth on failure. No-op of veth already exists.
create_veth() {
    VETHL=$1
    VETHR=$2
    shift 2

    ip link show $VETHL >/dev/null 2>&1 && ip link show $VETHR >/dev/null 2>&1 && return 0

    ip link add name $VETHL mtu $MTU type veth peer name $VETHR mtu $MTU || return 1

    if ! ip link set $VETHL up || ! ip link set $VETHR up || ! "$@" ; then
        ip link del $VETHL >/dev/null 2>&1 || true
        ip link del $VETHR >/dev/null 2>&1 || true
        return 1
    fi
}

destroy_bridge() {
    # It's important that detect_bridge_type has not been called so
    # we have distinct values for $BRIDGE and $DATAPATH. Make best efforts
    # to remove netdevs of any type with those names so `weave reset` can
    # recover from inconsistent states.
    for NETDEV in $BRIDGE $DATAPATH ; do
        if [ -d /sys/class/net/$NETDEV ] ; then
            if [ -d /sys/class/net/$NETDEV/bridge ] ; then
                ip link del $NETDEV
            else
                util_op delete-datapath $NETDEV
            fi
        fi
    done

    # Remove any lingering bridged fastdp, pcap and attach-bridge veths
    for VETH in $(ip -o link show | grep -o v${CONTAINER_IFNAME}[^:@]*) ; do
        ip link del $VETH >/dev/null 2>&1 || true
    done

    if [ "$DOCKER_BRIDGE" != "$BRIDGE" ] ; then
        run_iptables -t filter -D FORWARD -i $DOCKER_BRIDGE -o $BRIDGE -j DROP 2>/dev/null || true
    fi

    [ -n "$DOCKER_BRIDGE_IP" ] || DOCKER_BRIDGE_IP=$(util_op bridge-ip $DOCKER_BRIDGE)

    run_iptables -t filter -D INPUT -d 127.0.0.1/32 -p tcp --dport 6784 -m addrtype ! --src-type LOCAL -m conntrack ! --ctstate RELATED,ESTABLISHED -m comment --comment "Block non-local access to Weave Net control port" -j DROP >/dev/null 2>&1 || true
    run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p udp --dport 53  -j ACCEPT  >/dev/null 2>&1 || true
    run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p tcp --dport 53  -j ACCEPT  >/dev/null 2>&1 || true

    run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p tcp --dst $DOCKER_BRIDGE_IP --dport $PORT          -j DROP >/dev/null 2>&1 || true
    run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p udp --dst $DOCKER_BRIDGE_IP --dport $PORT          -j DROP >/dev/null 2>&1 || true
    run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p udp --dst $DOCKER_BRIDGE_IP --dport $(($PORT + 1)) -j DROP >/dev/null 2>&1 || true

    run_iptables -t filter -D FORWARD -i $BRIDGE ! -o $BRIDGE -j ACCEPT 2>/dev/null || true
    run_iptables -t filter -D FORWARD -o $BRIDGE -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT 2>/dev/null || true
    run_iptables -t filter -D FORWARD -i $BRIDGE -o $BRIDGE -j ACCEPT 2>/dev/null || true
    run_iptables -F WEAVE-NPC >/dev/null 2>&1 || true
    run_iptables -t filter -D FORWARD -o $BRIDGE -m comment --comment "NOTE: this must go before '-j KUBE-FORWARD'" -j WEAVE-NPC 2>/dev/null || true
    run_iptables -t filter -D FORWARD -o $BRIDGE -m state --state NEW -j NFLOG --nflog-group 86 2>/dev/null || true
    run_iptables -t filter -D FORWARD -o $BRIDGE -j DROP 2>/dev/null || true
    run_iptables -X WEAVE-NPC >/dev/null 2>&1 || true
    run_iptables -F WEAVE-NPC-EGRESS >/dev/null 2>&1 || true
    run_iptables -t filter -D FORWARD -i $BRIDGE -m comment --comment "NOTE: this must go before '-j KUBE-FORWARD'" -j WEAVE-NPC-EGRESS 2>/dev/null || true
    run_iptables -t filter -D INPUT -i $BRIDGE -j WEAVE-NPC-EGRESS 2>/dev/null || true
    run_iptables -X WEAVE-NPC-EGRESS >/dev/null 2>&1 || true
    run_iptables -F WEAVE-NPC-EGRESS-DEFAULT >/dev/null 2>&1 || true
    run_iptables -X WEAVE-NPC-EGRESS-DEFAULT >/dev/null 2>&1 || true
    run_iptables -F WEAVE-NPC-EGRESS-CUSTOM >/dev/null 2>&1 || true
    run_iptables -X WEAVE-NPC-EGRESS-CUSTOM >/dev/null 2>&1 || true
    run_iptables -F WEAVE-NPC-EGRESS-ACCEPT >/dev/null 2>&1 || true
    run_iptables -X WEAVE-NPC-EGRESS-ACCEPT >/dev/null 2>&1 || true

    run_iptables -F WEAVE-EXPOSE >/dev/null 2>&1 || true
    run_iptables -t filter -D FORWARD -o $BRIDGE -j WEAVE-EXPOSE 2>/dev/null || true
    run_iptables -X WEAVE-EXPOSE >/dev/null 2>&1 || true

    run_iptables -t nat -F WEAVE >/dev/null 2>&1 || true
    run_iptables -t nat -D POSTROUTING -j WEAVE >/dev/null 2>&1 || true
    run_iptables -t nat -D POSTROUTING -o $BRIDGE -j ACCEPT >/dev/null 2>&1 || true
    run_iptables -t nat -X WEAVE >/dev/null 2>&1 || true

    ipset destroy weaver-no-masq-local >/dev/null 2>&1 || true
}

add_iface_fastdp() {
    util_op add-datapath-interface $DATAPATH $1
}

add_iface_bridge() {
    ip link set $1 master $BRIDGE
}

add_iface_bridged_fastdp() {
    add_iface_bridge "$@"
}

attach_bridge() {
    bridge="$1"
    LOCAL_IFNAME=v${CONTAINER_IFNAME}bl$bridge
    GUEST_IFNAME=v${CONTAINER_IFNAME}bg$bridge

    create_veth $LOCAL_IFNAME $GUEST_IFNAME configure_veth_attached_bridge
}

configure_veth_attached_bridge() {
    add_iface_$BRIDGE_TYPE $LOCAL_IFNAME || return 1
    ip link set $GUEST_IFNAME master $bridge
}

router_bridge_opts() {
    echo --docker-bridge "$DOCKER_BRIDGE" --weave-bridge "$BRIDGE" --datapath "$DATAPATH"
    [ -z "$WEAVE_MTU" ] || echo --mtu "$WEAVE_MTU"
    [ -z $WEAVE_NO_FASTDP ] || echo --no-fastdp
    [ -z $WEAVE_NO_BRIDGED_FASTDP ] || echo --no-bridged-fastdp
}

######################################################################
# functions for interacting with containers
######################################################################

# Print an error to stderr and return with an indicative exit status
# if the container $1 does not exist or isn't running.
check_running() {
    if ! STATE=$(util_op container-state $1 2> /dev/null) ; then
        echo  "$1 container is not present. Have you launched it?" >&2
        return 1
    elif [ "$STATE" = "restarting" ] ; then
        echo "$1 container is restarting." >&2
        return 2
    elif [ "$STATE" != "running" ] ; then
        echo "$1 container is not running." >&2
        return 2
    fi
}

# Execute $@ only if the weave container is running
when_weave_running() {
    ! check_running $CONTAINER_NAME 2>/dev/null || "$@"
}

# Check that a container $1 with image $2 is not running
check_not_running() {
    STATE=$(util_op container-state $1 $2 2> /dev/null) || true
    case ${STATE} in
        "running")
            echo "$1 is already running; you can stop it with 'weave stop'." >&2
            return 3
            ;;
        "created" | "paused" | "restarting")
            echo "$1 is created, paused, or restarting; you can stop it with 'weave stop'." >&2
            return 1
            ;;
        "exited" | "dead")
            util_op remove-container $1 >/dev/null
            ;;
        "running image mismatch"*)
            echo "Found another running container named '$1'. Aborting." >&2
            return 2
            ;;
        "image mismatch"*)
            echo "Found another container named '$1'. Aborting." >&2
            return 2
            ;;
    esac
}

http_call() {
    addr="$1"
    http_verb="$2"
    url="$3"
    shift 3
    CURL_TMPOUT=/tmp/weave_curl_out_$$
    HTTP_CODE=$(curl -o $CURL_TMPOUT -w '%{http_code}' --connect-timeout 3 -s -S -X $http_verb "$@" http://$addr$url) || return $?
    case "$HTTP_CODE" in
        2??) # 2xx -> not an error; output response on stdout
            [ -f $CURL_TMPOUT ] && cat $CURL_TMPOUT
            retval=0
            ;;
        404) # treat as error but swallow response
            retval=4
            ;;
        *) # anything else is an error; output response on stderr
            [ -f $CURL_TMPOUT ] && cat $CURL_TMPOUT >&2
            retval=1
    esac
    rm -f $CURL_TMPOUT
    return $retval
}

call_weave() {
    TMPERR=/tmp/call_weave_err_$$
    retval=0
    http_call $HTTP_ADDR "$@" 2>$TMPERR || retval=$?
    if [ $retval -ne 0 ] ; then
        check_running $CONTAINER_NAME && cat $TMPERR >&2
    fi
    rm -f $TMPERR
    return $retval
}

death_msg() {
    echo "The $1 container has died. Consult the container logs for further details."
}

# Wait until container $1 is alive enough to respond to "GET /status"
# http request
wait_for_status() {
    container="$1"
    shift
    while true ; do
        "$@" GET /status >/dev/null 2>&1 && return 0
        if ! check_running $container >/dev/null 2>&1 ; then
            # stop it restarting
            util_op kill-container $container >/dev/null 2>&1 || true
            echo $(death_msg $container) >&2
            return 1
        fi
        fractional_sleep 0.1
    done
}

# Call $1 for all containers, passing container ID, all MACs and all IPs
with_container_addresses() {
    COMMAND_WCA=$1
    shift 1

    CONTAINER_ADDRS=$(util_op container-addrs $BRIDGE "$@") || return 1
    echo "$CONTAINER_ADDRS" |  while read CONTAINER_ID CONTAINER_IFACE CONTAINER_MAC CONTAINER_IPS; do
        $COMMAND_WCA "$CONTAINER_ID" "$CONTAINER_IFACE" "$CONTAINER_MAC" "$CONTAINER_IPS"
    done
}

echo_addresses() {
    echo $(printf "%.12s" $1) $3 $4
}

echo_ips() {
    for CIDR in $4; do
        echo ${CIDR%/*}
    done
}

echo_cidrs() {
    echo $4
}

peer_args() {
    res=''
    sep=''
    for p in "$@" ; do
        res="$res${sep}peer=$p"
        sep="&"
    done
    echo "$res"
}

######################################################################
# CNI helpers
######################################################################

install_cni_plugin() {
    mkdir -p $1 || return 1
    if [ ! -f "$1/$CNI_PLUGIN_NAME" ]; then
        cp /usr/bin/weaveutil "$1/$CNI_PLUGIN_NAME"
    fi
}

upgrade_cni_plugin_symlink() {
    # Remove potential temporary symlink from previous failed upgrade:
    rm -f $1/$2.tmp
    # Atomically create a symlink to the plugin:
    ln -s "$CNI_PLUGIN_NAME" $1/$2.tmp && mv -f $1/$2.tmp $1/$2
}

upgrade_cni_plugin() {
    # Check if weave-net and weave-ipam are (legacy) copies of the plugin, and
    # if so remove these so symlinks can be used instead from now onwards.
    if [ -f $1/weave-net  -a ! -L $1/weave-net  ];  then rm $1/weave-net;   fi
    if [ -f $1/weave-ipam -a ! -L $1/weave-ipam ];  then rm $1/weave-ipam;  fi

    # Create two symlinks to the plugin, as it has different
    # behaviour depending on its name:
    if [ "$(readlink -f $1/weave-net)" != "$1/$CNI_PLUGIN_NAME" ]; then
        upgrade_cni_plugin_symlink $1 weave-net
    fi
    if [ "$(readlink -f $1/weave-ipam)" != "$1/$CNI_PLUGIN_NAME" ]; then
        upgrade_cni_plugin_symlink $1 weave-ipam
    fi
}

create_cni_config() {
    cat >"$1" <<EOF
{
    "cniVersion": "0.3.0",
    "name": "weave",
    "plugins": [
        {
            "name": "weave",
            "type": "weave-net",
            "hairpinMode": $2
        },
        {
            "type": "portmap",
            "capabilities": {"portMappings": true},
            "snat": true
        }
    ]
}
EOF
}

setup_cni() {
    # if env var HAIRPIN_MODE is not set, default it to true
    HAIRPIN_MODE=${HAIRPIN_MODE:-true}
    if install_cni_plugin $CNI_PLUGIN_DIR ; then
        upgrade_cni_plugin $CNI_PLUGIN_DIR
    fi

    # Weave will use .conflist for versions > 2.4.0. So in case of upgrade of old
    # clusters with Weave version <= 2.4.0 remove existing 10-weave.conf
    rm -f $HOST_ROOT/etc/cni/net.d/10-weave.conf

    if [ -d $HOST_ROOT/etc/cni/net.d -a ! -f $HOST_ROOT/etc/cni/net.d/10-weave.conflist ] ; then
        create_cni_config $HOST_ROOT/etc/cni/net.d/10-weave.conflist $HAIRPIN_MODE
    fi
}

######################################################################
# weaveDNS helpers
######################################################################

dns_args() {
    retval=0
    # NB: this is memoized
    DNS_DOMAIN=${DNS_DOMAIN:-$(call_weave GET /domain 2>/dev/null)} || retval=$?
    [ "$retval" -eq 4 ] && return 0
    DNS_DOMAIN=${DNS_DOMAIN:-weave.local.}
    DNS_ADDRESS=${DNS_ADDRESS:-$(call_weave GET /dns-address 2>/dev/null)}

    DNS_ARGS="--dns=$DNS_ADDRESS --dns-search=$DNS_DOMAIN"
}

# Iff the container in $1 has an FQDN, invoke $2 as a command passing
# the container as the first argument, the FQDN as the second argument
# and $3.. as additional arguments
with_container_fqdn() {
    CONT="$1"
    COMMAND_WCF="$2"
    shift 2

    CONT_FQDN=$(util_op container-fqdn $CONT 2>/dev/null) || return 0
    CONT_NAME=${CONT_FQDN%%.*}
    [ "$CONT_NAME" = "$CONT_FQDN" -o "$CONT_NAME." = "$CONT_FQDN" ] || $COMMAND_WCF "$CONT" "$CONT_FQDN" "$@"
}

# Register FQDN in $2 as names for addresses $3.. under full container ID $1
put_dns_fqdn() {
    CHECK_ALIVE="-d check-alive=true"
    put_dns_fqdn_helper "$@"
}

put_dns_fqdn_no_check_alive() {
    CHECK_ALIVE=
    put_dns_fqdn_helper "$@"
}

put_dns_fqdn_helper() {
    CONTAINER_ID="$1"
    FQDN="$2"
    shift 2

    for ADDR in "$@" ; do
        call_weave PUT /name/$CONTAINER_ID/${ADDR%/*} --data-urlencode fqdn=$FQDN $CHECK_ALIVE || true
    done
}

# Delete all names for addresses $3.. under full container ID $1
delete_dns() {
    CONTAINER_ID="$1"
    shift 1

    for ADDR in "$@" ; do
        call_weave DELETE /name/$CONTAINER_ID/${ADDR%/*} || true
    done
}

# Delete any FQDNs $2 from addresses $3.. under full container ID $1
delete_dns_fqdn() {
    CONTAINER_ID="$1"
    FQDN="$2"
    shift 2

    for ADDR in "$@" ; do
        call_weave DELETE /name/$CONTAINER_ID/${ADDR%/*}?fqdn=$FQDN || true
    done
}

is_ip() {
    echo "$1" | grep -E "^$IP_REGEXP$" >/dev/null
}

collect_ip_args() {
    IP_ARGS=""
    IP_COUNT=0
    while is_ip "$1" ; do
        IP_ARGS="$IP_ARGS $1"
        IP_COUNT=$((IP_COUNT + 1))
        shift 1
    done
}

collect_dns_add_remove_args() {
    collect_ip_args "$@"
    shift $IP_COUNT
    [ $# -gt 0 -a "$1" != "-h" ] &&    C="$1" && shift 1
    [ $# -eq 2 -a "$1"  = "-h" ] && FQDN="$2" && shift 2
    [ $# -eq 0 -a \( -n "$C" -o \( $IP_COUNT -gt 0 -a -n "$FQDN" \) \) ] || usage
    check_running $CONTAINER_NAME
    if [ -n "$C" ] ; then
        check_running $C
        CONTAINER=$(util_op container-id $C)
        [ $IP_COUNT -gt 0 ] || IP_ARGS=$(with_container_addresses echo_ips $CONTAINER)
    fi
}

######################################################################
# IP Allocation Management helpers
######################################################################

is_cidr() {
    echo "$1" | grep -E "^$CIDR_REGEXP$" >/dev/null
}

collect_cidr_args() {
    CIDR_ARGS=""
    CIDR_ARG_COUNT=0
    while [ "$1" = "net:default" ] || is_cidr "$1" || is_cidr "${1#ip:}" || is_cidr "${1#net:}" ; do
        CIDR_ARGS="$CIDR_ARGS ${1#ip:}"
        CIDR_ARG_COUNT=$((CIDR_ARG_COUNT + 1))
        shift 1
    done
}

check_overlap() {
    util_op netcheck $1 $BRIDGE
}

detect_awsvpc() {
    [ "$(call_weave GET /ipinfo/tracker 2>/dev/null)" != "awsvpc" ] || AWSVPC=1
}

# Call IPAM as necessary to lookup or allocate addresses
#
# $1 is one of 'lookup', 'allocate' or 'allocate_no_check_alive', $2
# is the full container id. The remaining args are previously parsed
# CIDR_ARGS.
#
# Populates ALL_CIDRS and IPAM_CIDRS
ipam_cidrs() {
    case $1 in
        lookup)
            METHOD=GET
            CHECK_ALIVE=
            ;;
        allocate)
            METHOD=POST
            CHECK_ALIVE="?check-alive=true"
            detect_awsvpc
            if [ -n "$AWSVPC" -a $# -gt 2 ] ; then
                echo "Error: no IP addresses or subnets may be specified in AWSVPC mode" >&2
                return 1
            fi
            ;;
        allocate_no_check_alive)
            METHOD=POST
            CHECK_ALIVE=
            ;;
    esac
    CONTAINER_ID="$2"
    shift 2
    ALL_CIDRS=""
    IPAM_CIDRS=""
    # If no addresses passed in, select the default subnet
    [ $# -gt 0 ] || set -- net:default
    for arg in "$@" ; do
        if [ "${arg%:*}" = "net" ] ; then
            if [ "$arg" = "net:default" ] ; then
                IPAM_URL=/ip/$CONTAINER_ID
            else
                IPAM_URL=/ip/$CONTAINER_ID/"${arg#net:}"
            fi
            retval=0
            CIDR=$(call_weave $METHOD $IPAM_URL$CHECK_ALIVE) || retval=$?
            if [ $retval -eq 4 -a "$METHOD" = "POST" ] ; then
                echo "IP address allocation must be enabled to use 'net:'" >&2
                return 1
            fi
            [ $retval -gt 0 ] && return $retval
            IPAM_CIDRS="$IPAM_CIDRS $CIDR"
            ALL_CIDRS="$ALL_CIDRS $CIDR"
        else
            if [ "$METHOD" = "POST" ] ; then
                # Assignment of a plain IP address; warn if it clashes but carry on
                check_overlap $arg || true
                # Abort on failure, but not 4 (=404), which means IPAM is disabled
                when_weave_running http_call $HTTP_ADDR PUT /ip/$CONTAINER_ID/$arg$CHECK_ALIVE || [ $? -eq 4 ] || return 1
            fi
            ALL_CIDRS="$ALL_CIDRS $arg"
        fi
    done
}

show_addrs() {
    addrs=
    for cidr in "$@" ; do
        addrs="$addrs ${cidr%/*}"
    done
    echo $addrs
}

######################################################################
# weave proxy helpers
######################################################################

docker_client_args() {
    while [ $# -gt 0 ]; do
        case "$1" in
          -H|--host)
            DOCKER_CLIENT_HOST="$2"
            shift
            ;;
          -H=*|--host=*)
            DOCKER_CLIENT_HOST="${1#*=}"
            ;;
        esac
        shift
    done
}

# TODO: Handle relative paths for args
# TODO: Handle args with spaces
tls_arg() {
    PROXY_VOLUMES="$PROXY_VOLUMES -v $2:/home/weave/tls/$3.pem:ro"
    PROXY_ARGS="$PROXY_ARGS $1 /home/weave/tls/$3.pem"
}

# TODO: Handle relative paths for args
# TODO: Handle args with spaces
host_arg() {
  PROXY_HOST="$1"
  if [ "$PROXY_HOST" != "${PROXY_HOST#unix://}" ]; then
    host=$(dirname ${PROXY_HOST#unix://})
    if [ "$host" = "${host#/}" ]; then
      echo "When launching the proxy, unix sockets must be specified as an absolute path." >&2
      exit 1
    fi
    PROXY_VOLUMES="$PROXY_VOLUMES -v /var/run/weave:/var/run/weave"
  fi
  PROXY_ARGS="-H $1 $PROXY_ARGS"
}

proxy_parse_args() {
    while [ $# -gt 0 ]; do
        case "$1" in
          -H)
            host_arg "$2"
            shift
            ;;
          -H=*)
            host_arg "${1#*=}"
            ;;
          -no-detect-tls|--no-detect-tls)
            PROXY_TLS_DETECTION_DISABLED=1
            ;;
          -tls|--tls|-tlsverify|--tlsverify)
            PROXY_TLS_ENABLED=1
            PROXY_ARGS="$PROXY_ARGS $1"
            ;;
          --tlscacert)
            tls_arg "$1" "$2" ca
            shift
            ;;
          --tlscacert=*)
            tls_arg "${1%%=*}" "${1#*=}" ca
            ;;
          --tlscert)
            tls_arg "$1" "$2" cert
            shift
            ;;
          --tlscert=*)
            tls_arg "${1%%=*}" "${1#*=}" cert
            ;;
          --tlskey)
            tls_arg "$1" "$2" key
            shift
            ;;
          --tlskey=*)
            tls_arg "${1%%=*}" "${1#*=}" key
            ;;
          *)
            REMAINING_ARGS="$REMAINING_ARGS $1"
            ;;
        esac
        shift
    done
}

proxy_args() {
    REMAINING_ARGS=""
    PROXY_VOLUMES=""
    PROXY_ARGS=""
    PROXY_TLS_ENABLED=""
    PROXY_TLS_DETECTION_DISABLED=""
    PROXY_HOST=""
    proxy_parse_args "$@"

    if [ -z "$PROXY_TLS_ENABLED" -a -z "$PROXY_TLS_DETECTION_DISABLED" ] ; then
        if ! DOCKER_TLS_ARGS=$(util_op docker-tls-args) ; then
            echo -n "Warning: unable to detect proxy TLS configuration. To enable TLS, " >&2
            echo -n "launch the proxy with 'weave launch' and supply TLS options. " >&2
            echo "To suppress this warning, supply the '--no-detect-tls' option." >&2
        else
            proxy_parse_args $DOCKER_TLS_ARGS
        fi
    fi
    if [ -z "$PROXY_HOST" ] ; then
      case "$DOCKER_CLIENT_HOST" in
        ""|unix://*)
          PROXY_HOST="unix:///var/run/weave/weave.sock"
          ;;
        *)
          PROXY_HOST="tcp://0.0.0.0:$PROXY_PORT"
          ;;
      esac
      host_arg "$PROXY_HOST"
    fi
}

proxy_addr() {
    if addr="$(call_weave GET /proxyaddrs)" ; then
      [ -n "$addr" ] || return 1
      echo "$addr" | sed "s/0.0.0.0/$PROXY_HOST/g" | cut -d $'\n' -f1
    else
      return 1
    fi
}

warn_if_stopping_proxy_in_env() {
    if PROXY_ADDR=$(proxy_addr 2>/dev/null) ; then
        [ "$PROXY_ADDR" != "$DOCKER_CLIENT_HOST" ] || echo "WARNING: It appears that your environment is configured to use the Weave Docker API proxy. Stopping it will break this and subsequent docker invocations. To restore your environment, run 'eval \$(weave env --restore)'."
    fi
}

######################################################################
# launch helpers
######################################################################

launch() {
    LAUNCHING_ROUTER=1
    check_forwarding_rules

    CONTAINER_PORT=$PORT
    ARGS=
    IPRANGE=
    IPRANGE_SPECIFIED=

    [ -n "$DOCKER_BRIDGE_IP" ] || DOCKER_BRIDGE_IP=$(util_op bridge-ip $DOCKER_BRIDGE)

    while [ $# -gt 0 ] ; do
        case "$1" in
            -password|--password)
                [ $# -gt 1 ] || usage
                WEAVE_PASSWORD="$2"
                export WEAVE_PASSWORD
                shift
                ;;
            --password=*)
                WEAVE_PASSWORD="${1#*=}"
                export WEAVE_PASSWORD
                ;;
            -port|--port)
                [ $# -gt 1 ] || usage
                CONTAINER_PORT="$2"
                shift
                ;;
            --port=*)
                CONTAINER_PORT="${1#*=}"
                ;;
            -iprange|--iprange|--ipalloc-range)
                [ $# -gt 1 ] || usage
                IPRANGE="$2"
                IPRANGE_SPECIFIED=1
                shift
                ;;
            --ipalloc-range=*)
                IPRANGE="${1#*=}"
                IPRANGE_SPECIFIED=1
                ;;
            --no-restart)
                RESTART_POLICY=
                ;;
            *)
                ARGS="$ARGS '$(echo "$1" | sed "s|'|'\"'\"'|g")'"
                ;;
        esac
        shift
    done
    eval "set -- $ARGS"

    setup_cni
    validate_bridge_type

    if [ -z "$IPRANGE_SPECIFIED" ] ; then
        IPRANGE="10.32.0.0/12"
        if ! check_overlap $IPRANGE ; then
            echo "ERROR: Default --ipalloc-range $IPRANGE overlaps with existing route on host." >&2
            echo "You must pick another range and set it on all hosts." >&2
            exit 1
        fi
    else
        if [ -n "$IPRANGE" ] && ! check_overlap $IPRANGE ; then
            echo "WARNING: Specified --ipalloc-range $IPRANGE overlaps with existing route on host." >&2
            echo "Unless this is deliberate, you must pick another range and set it on all hosts." >&2
        fi
    fi

    # Figure out the location of the actual resolv.conf file because
    # we want to bind mount its directory into the container.
    if [ -L ${HOST_ROOT:-/}/etc/resolv.conf ]; then # symlink
        # This assumes a host with readlink in FHS directories...
        # Ideally, this would resolve the symlink manually, without
        # using host commands.
        RESOLV_CONF=$(chroot ${HOST_ROOT:-/} readlink -f /etc/resolv.conf)
    else
        RESOLV_CONF=/etc/resolv.conf
    fi
    RESOLV_CONF_DIR=$(dirname "$RESOLV_CONF")
    RESOLV_CONF_BASE=$(basename "$RESOLV_CONF")

    docker_client_args $DOCKER_CLIENT_ARGS
    proxy_args "$@"

    mkdir -p /var/run/weave

    # Create a data-only container for persistence data
    if ! util_op container-state $DB_CONTAINER_NAME > /dev/null 2>&1 ; then
        protect_against_docker_hang
        util_op create-volume-container $DB_CONTAINER_NAME $WEAVEDB_IMAGE $VOLUMES_LABEL \
            /weavedb >/dev/null
    fi
    # Create a data-only container to mount the weavewait files from
    if ! util_op container-state $VOLUMES_CONTAINER_NAME > /dev/null 2>&1 ; then
        protect_against_docker_hang
        util_op create-volume-container $VOLUMES_CONTAINER_NAME $EXEC_IMAGE $VOLUMES_LABEL \
            /w /w-noop /w-nomcast >/dev/null
    fi

    # Set WEAVE_DOCKER_ARGS in the environment in order to supply
    # additional parameters, such as resource limits, to docker
    # when launching the weave container.
    WEAVE_CONTAINER=$(util_op run-container --name $CONTAINER_NAME \
        $(docker_run_options) \
        $RESTART_POLICY \
        --pid host \
        --volumes-from $DB_CONTAINER_NAME \
        --volumes-from $VOLUMES_CONTAINER_NAME \
        $PROXY_VOLUMES \
        -v /var/run/weave:/var/run/weave \
        -v $RESOLV_CONF_DIR:/var/run/weave/etc \
        -v /run/docker/plugins:/run/docker/plugins \
        -v /etc:/host/etc -v /var/lib/dbus:/host/var/lib/dbus \
        -e DOCKER_BRIDGE \
        -e WEAVE_DEBUG \
        -e WEAVE_HTTP_ADDR \
        -e WEAVE_PASSWORD \
        -e EXEC_IMAGE=$EXEC_IMAGE \
        -e CHECKPOINT_DISABLE \
        $WEAVE_DOCKER_ARGS \
        $IMAGE \
        $COVERAGE_ARGS \
        --port $CONTAINER_PORT --nickname "$(hostname)" \
        --host-root=/host \
        $(router_bridge_opts) \
        --ipalloc-range "$IPRANGE" \
        --dns-listen-address $DOCKER_BRIDGE_IP:53 \
        --http-addr $HTTP_ADDR \
        --status-addr $STATUS_ADDR \
        --resolv-conf "/var/run/weave/etc/$RESOLV_CONF_BASE" \
        $PROXY_ARGS \
        $REMAINING_ARGS)
    wait_for_status $CONTAINER_NAME http_call $HTTP_ADDR
}

stop() {
    util_op remove-plugin-network weave || true
    warn_if_stopping_proxy_in_env
    util_op stop-container $CONTAINER_NAME >/dev/null 2>&1 || echo "Weave is not running (ignore on Kubernetes)." >&2
    # In case user has upgraded from <v2.0 and left old containers running
    util_op stop-container $OLD_PLUGIN_CONTAINER_NAME >/dev/null 2>&1 || true
    util_op stop-container $OLD_PROXY_CONTAINER_NAME >/dev/null 2>&1 || true
    conntrack -D -p udp --dport $PORT >/dev/null 2>&1 || true
}

protect_against_docker_hang() {
    # Since the plugin is not running, remove its socket so Docker doesn't try to talk to it
    rm -f $HOST_ROOT/run/docker/plugins/weave.sock $HOST_ROOT/run/docker/plugins/weavemesh.sock
}

######################################################################
# main (remote and --local)
######################################################################

[ $(id -u) = 0 ] || {
    echo "weave must be run as 'root' when run locally" >&2
    exit 1
}

uname -s -r | sed -n -e 's|^\([^ ]*\) \([0-9][0-9]*\)\.\([0-9][0-9]*\).*|\1 \2 \3|p' | {
    if ! read sys maj min ; then
        echo "ERROR: Unable to parse operating system version $(uname -s -r)" >&2
        exit 1
    fi

    if [ "$sys" != 'Linux' ] ; then
        echo "ERROR: Operating systems other than Linux are not supported (you have $(uname -s -r))" >&2
        exit 1
    fi

    if ! [ \( "$maj" -eq 3 -a "$min" -ge 8 \) -o "$maj" -gt 3 ] ; then
        echo "WARNING: Linux kernel version 3.8 or newer is required (you have ${maj}.${min})" >&2
    fi
}

if ! command_exists ip ; then
    echo "ERROR: ip utility is missing. Please install it." >&2
    exit 1
fi

[ $# -gt 0 ] || usage
COMMAND=$1
shift 1

case "$COMMAND" in
    setup|setup-cni)
        setup_cni
        ;;
    version)
        [ $# -eq 0 ] || usage
        VERSION="weave $(call_weave GET /report --get --data-urlencode "format={{ .Version }}" 2> /dev/null)" || VERSION="$(/home/weave/weaver $COVERAGE_ARGS --version)"
        echo $VERSION
        ;;
    attach-bridge)
        if detect_bridge_type ; then
            attach_bridge ${1:-$DOCKER_BRIDGE}
            insert_iptables_rule nat POSTROUTING -o $BRIDGE -j ACCEPT
        else
            echo "Weave bridge not found. Please run 'weave launch' and try again" >&2
            exit 1
        fi
        ;;
    bridge-type)
        detect_bridge_type && echo $BRIDGE_TYPE
        ;;
    launch)
        check_not_running $CONTAINER_NAME $BASE_IMAGE
        if http_call $HTTP_ADDR GET /status >/dev/null 2>&1 ; then
            echo "Weave Net is already running" >&2
            exit 1
        fi
        # Plugin and proxy are started by default. Should users additionally pass --plugin=false or --proxy=false, their overrides will take precedence when parsed by Go.
        launch --plugin --proxy "$@"
        echo "$WEAVE_CONTAINER"
        ;;
    env)
        if PROXY_ADDR=$(proxy_addr) ; then
            [ "$PROXY_ADDR" = "$DOCKER_CLIENT_HOST" ] || RESTORE="ORIG_DOCKER_HOST=$DOCKER_CLIENT_HOST"
            echo "export DOCKER_HOST=$PROXY_ADDR $RESTORE"
        fi
        ;;
    config)
        PROXY_ADDR=$(proxy_addr) && echo "-H=$PROXY_ADDR"
        ;;
    connect)
        [ $# -gt 0 ] || usage
        [ "$1" = "--replace" ] && replace="-d replace=true" && shift
        call_weave POST /connect $replace -d $(peer_args "$@")
        ;;
    forget)
        [ $# -gt 0 ] || usage
        call_weave POST /forget -d $(peer_args "$@")
        ;;
    status)
        res=0
        SUB_STATUS=
        STATUS_URL="/status"
        SUB_COMMAND="$@"
        while [ $# -gt 0 ] ; do
            SUB_STATUS=1
            STATUS_URL="$STATUS_URL/$1"
            shift
        done
        [ -n "$SUB_STATUS" ] || echo
        call_weave GET $STATUS_URL || res=$?
        if [ $res -eq 4 ] ; then
            echo "Invalid 'weave status' sub-command: $SUB_COMMAND" >&2
            usage
        fi
        [ -n "$SUB_STATUS" ] || echo
        [ $res -eq 0 ]
        ;;
    report)
        if [ $# -gt 0 ] ; then
            [ $# -eq 2 -a "$1" = "-f" ] || usage
            call_weave GET /report --get --data-urlencode "format=$2"
        else
            call_weave GET /report -H 'Accept: application/json'
        fi
        ;;
    run|start|restart|launch-plugin|stop-plugin|launch-proxy|stop-proxy|launch-router|stop-router)
        echo "The 'weave $COMMAND' command has been removed as of Weave Net version 2.0" >&2
        echo "Please see release notes for further information" >&2
        exit 1
        ;;
    dns-args)
        dns_args "$@"
        echo -n $DNS_ARGS
        ;;
    docker-bridge-ip)
        util_op bridge-ip $DOCKER_BRIDGE
        ;;
    attach)
        DNS_EXTRA_HOSTS=
        REWRITE_HOSTS=
        ATTACH_ARGS=
        collect_cidr_args "$@"
        shift $CIDR_ARG_COUNT
        WITHOUT_DNS=
        while [ $# -gt 0 ]; do
            case "$1" in
                --without-dns)
                    WITHOUT_DNS=1
                    ;;
                --rewrite-hosts)
                    REWRITE_HOSTS=1
                    ;;
                --add-host)
                    DNS_EXTRA_HOSTS="$2 $DNS_EXTRA_HOSTS"
                    shift
                    ;;
                --add-host=*)
                    DNS_EXTRA_HOSTS="${1#*=} $DNS_EXTRA_HOSTS"
                    ;;
                --no-multicast-route)
                    ATTACH_ARGS="$1"
                    ;;
                *)
                    break
                    ;;
            esac
            shift
        done
        [ $# -eq 1 ] || usage
        CONTAINER=$(util_op container-id $1)
        ipam_cidrs allocate $CONTAINER $CIDR_ARGS
        if [ -n "$REWRITE_HOSTS" ] ; then
            # rewrite /etc/hosts, unlinking the file (so Docker does
            # not modify it again) but leaving it with valid contents.
            util_op rewrite-etc-hosts "$CONTAINER" "$EXEC_IMAGE" "$ALL_CIDRS" $DNS_EXTRA_HOSTS
        fi
        [ -n "$AWSVPC" ] && ATTACH_ARGS="--no-multicast-route --keep-tx-on"
        util_op attach-container $ATTACH_ARGS $CONTAINER $BRIDGE $ALL_CIDRS >/dev/null
        [ -n "$WITHOUT_DNS" ] || when_weave_running with_container_fqdn $CONTAINER put_dns_fqdn $ALL_CIDRS
        show_addrs $ALL_CIDRS
        ;;
    detach)
        collect_cidr_args "$@"
        shift $CIDR_ARG_COUNT
        [ $# -eq 1 ] || usage
        CONTAINER=$(util_op container-id $1)
        ipam_cidrs lookup $CONTAINER $CIDR_ARGS
        util_op detach-container $CONTAINER $ALL_CIDRS >/dev/null
        when_weave_running with_container_fqdn $CONTAINER delete_dns_fqdn $ALL_CIDRS
        for CIDR in $IPAM_CIDRS ; do
            call_weave DELETE /ip/$CONTAINER/${CIDR%/*}
        done
        show_addrs $ALL_CIDRS
        ;;
    dns-add)
        collect_dns_add_remove_args "$@"
        FN=put_dns_fqdn
        [ -z "$CONTAINER" ] && CONTAINER=weave:extern && FN=put_dns_fqdn_no_check_alive
        if [ -n "$FQDN" ] ; then
            $FN $CONTAINER $FQDN $IP_ARGS
        else
            with_container_fqdn $CONTAINER $FN $IP_ARGS
        fi
        ;;
    dns-remove)
        collect_dns_add_remove_args "$@"
        [ -z "$CONTAINER" ] && CONTAINER=weave:extern
        if [ -n "$FQDN" ] ; then
            delete_dns_fqdn $CONTAINER $FQDN $IP_ARGS
        else
            delete_dns $CONTAINER $IP_ARGS
        fi
        ;;
    dns-lookup)
        [ $# -eq 1 ] || usage
        DNS_ADDRESS=${DNS_ADDRESS:-$(call_weave GET /dns-address-port 2>/dev/null)}
        dig @${DNS_ADDRESS%:*} -p ${DNS_ADDRESS#*:} +short $1
        ;;
    expose)
        WITHOUT_MASQUERADE=
        FQDN=
        collect_cidr_args "$@"
        shift $CIDR_ARG_COUNT
        while [ $# -gt 0 ]; do
            case "$1" in
                -h)
                    [ -z $FQDN ] && FQDN=$2 && shift || usage
                    ;;
                --without-masquerade)
                    WITHOUT_MASQUERADE=1
                    ;;
                *)
                    break
                    ;;
            esac
            shift
        done
        [ $# -eq 0 ] || usage
        expose_ip
        show_addrs $ALL_CIDRS
        ;;
    hide)
        collect_cidr_args "$@"
        shift $CIDR_ARG_COUNT
        ipam_cidrs lookup weave:expose $CIDR_ARGS
        for CIDR in $ALL_CIDRS ; do
            if ip addr show dev $BRIDGE | grep -qF $CIDR ; then
                ip addr del dev $BRIDGE $CIDR
                delete_iptables_rule nat WEAVE -d $CIDR ! -s $CIDR -j MASQUERADE
                delete_iptables_rule nat WEAVE -s $CIDR ! -d $CIDR -j MASQUERADE
                delete_iptables_rule filter WEAVE-EXPOSE -d $CIDR -j ACCEPT
                when_weave_running delete_dns weave:expose $CIDR
            fi
        done
        for CIDR in $IPAM_CIDRS ; do
            call_weave DELETE /ip/weave:expose/${CIDR%/*}
        done
        show_addrs $ALL_CIDRS
        ;;
    ps)
        [ $# -eq 0 ] && CONTAINERS="weave:expose weave:allids" || CONTAINERS="$@"
        with_container_addresses echo_addresses $CONTAINERS
        ;;
    stop)
        [ $# -eq 0 ] || usage
        stop
        ;;
    reset)
        [ $# -eq 0 ] || [ $# -eq 1 -a "$1" = "--force" ] || usage
        res=0
        [ "$1" = "--force" ] || check_running $CONTAINER_NAME 2>/dev/null || res=$?
        case $res in
            0)
                call_weave DELETE /peer >/dev/null 2>&1 || true
                fractional_sleep 0.5 # Allow some time for broadcast updates to go out
                ;;
            1)
                # No such container; assume user already did reset
                ;;
            2)
                echo "ERROR: weave is not running; unable to remove from cluster." >&2
                echo "Re-launch weave before reset or use --force to override." >&2
                exit 1
                ;;
        esac
        stop
        for NAME in $CONTAINER_NAME $OLD_PROXY_CONTAINER_NAME $OLD_PLUGIN_CONTAINER_NAME ; do
            util_op remove-container -f $NAME >/dev/null 2>&1 || true
        done
        protect_against_docker_hang
        VOLUME_CONTAINERS=$(util_op list-containers $VOLUMES_LABEL)
        [ -n "$VOLUME_CONTAINERS" ] && util_op remove-container -v $VOLUME_CONTAINERS  >/dev/null 2>&1 || true
        # weave-kube and v2-plugin put this file in different places; remove either
        rm -f $HOST_ROOT/var/lib/weave/weave-netdata.db >/dev/null 2>&1 || true
        rm -f $HOST_ROOT/var/lib/weave/weavedata.db     >/dev/null 2>&1 || true
        destroy_bridge
        for LOCAL_IFNAME in $(ip link show | grep v${CONTAINER_IFNAME}pl | cut -d ' ' -f 2 | tr -d ':') ; do
            ip link del ${LOCAL_IFNAME%@*} >/dev/null 2>&1 || true
        done
        ;;
    rmpeer)
        [ $# -gt 0 ] || usage
        res=0
        for PEER in "$@" ; do
            call_weave DELETE /peer/$PEER || res=1
        done
        [ $res -eq 0 ]
        ;;
    prime)
        call_weave GET /ring
        ;;
    *)
        echo "Unknown weave command '$COMMAND'" >&2
        usage
        ;;
esac
